EP1564905B1 - An apparatus and a method for distributing a transmission power in a cellular communications network - Google Patents

An apparatus and a method for distributing a transmission power in a cellular communications network Download PDF

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Publication number
EP1564905B1
EP1564905B1 EP05002833A EP05002833A EP1564905B1 EP 1564905 B1 EP1564905 B1 EP 1564905B1 EP 05002833 A EP05002833 A EP 05002833A EP 05002833 A EP05002833 A EP 05002833A EP 1564905 B1 EP1564905 B1 EP 1564905B1
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EP
European Patent Office
Prior art keywords
transmission power
uplink transmission
channel
dpcch
terminal
Prior art date
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Expired - Fee Related
Application number
EP05002833A
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German (de)
English (en)
French (fr)
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EP1564905A2 (en
EP1564905A3 (en
Inventor
Rizwan c/o Samsung Electr. Research Inst. Hassan
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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Publication of EP1564905A3 publication Critical patent/EP1564905A3/en
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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/005—Control of transmission; Equalising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/14—Separate analysis of uplink or downlink
    • H04W52/146—Uplink power control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/281—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission taking into account user or data type priority
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/28—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
    • H04W52/286—TPC being performed according to specific parameters using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission during data packet transmission, e.g. high speed packet access [HSPA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0473—Wireless resource allocation based on the type of the allocated resource the resource being transmission power
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/06—TPC algorithms
    • H04W52/16—Deriving transmission power values from another channel
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/36—TPC using constraints in the total amount of available transmission power with a discrete range or set of values, e.g. step size, ramping or offsets

Definitions

  • This invention relates to the field of power control in mobile communications networks. More particularly, but not exclusively, the invention relates to control of the uplink transmission power.
  • a user equipment (UE) for the use in cellular communications networks such as the Universal Mobile Telecommunications System (UMTS) has a limited amount of power resources available for transmitting user and control data in the uplink direction to the base stations of the network.
  • the network may limit the UE power allowed to transmit in the uplink direction in order to ensure that the signal achieves a predetermined signal-to-noise ratio.
  • the allowed or available uplink transmission power may be shared by a number of channels transmitted at the same time.
  • the UE may often have to operate at or near maximum transmission power.
  • the UE detects that it may have a power problem such as it is required to serve multiple channels with a total transmission power exceeding the available or allowed uplink transmission power, there are two mechanisms foreseen in UMTS to handle such power "shortages".
  • the first mechanism is the so-called long-term behaviour.
  • the UE is controlling the data rate used for uplink transmission power.
  • the network allocates a range of suitable bit rates or transport formats to the UE.
  • the UE selects an appropriate transport format from the allowed set according to its buffer occupancy and power availability.
  • the UE will reduce its data rate by selecting a lower data rate transport format. For example, if a UE is running low on power at the edge of a cell, it will eliminate certain allowed Transport Format Combinations (TFCs) from the set of allowed TFCs given by the network. In this manner, the UE will try to avoid a power problem by selecting an appropriate transport format corresponding to a lower data rate at the beginning of the next transmission frame.
  • TFCs Transport Format Combinations
  • 3GPP 3 rd Generation Partnership Project
  • MAC Medium Access Control
  • FDD Radio Resource Management
  • the second mechanism is the so-called short-term behaviour.
  • the UE will apply the short-term behaviour when the UE is already experiencing a power problem such as described above.
  • the uplink transmission power is scaled down such that the maximal transmission power is not exceeded.
  • This mechanism can be applied directly for transmission in the next slot rather than at the beginning of the next transmission frame as in the case of the above described long term behaviour.
  • HSDPA High Speed Downlink Packet Access
  • HS-DPCCH High Speed-Dedicated Physical Control Channel
  • ETSI TS 125 214 dated December 2003 discloses an ETSI standard, which refers to a universal mobile telecommunications system and specifies the characteristics of physical layer procedures in a FDD mode of the UTRA.
  • An initial uplink DPCCH transmit power is set by higher layers, wherein an uplink transmit power control procedure simultaneously controls the power of a DPCCH and its corresponding DPDCHs if present. The relative transmit power offset between DPCCH and DPDCHs is present.
  • the relative transmit power offset between DPCCH and DPDCHs is determined by the network and is computed using gain factors signaled to a UE using higher layer signaling.
  • the UE transmit power shall not exceed a maximum allowed value which is the lower out of the maximum output power of the terminal power class and a value which may be set by higher layer signaling.
  • Uplink power control shall be performed while the UE transmit power is below the maximum allowed output power.
  • the uplink DPCCH and DPDCH(s) are transmitted on different codes. Gain factors ⁇ c and ⁇ d may vary for each transport format combination, TFC.
  • ⁇ c and ⁇ d are signaled for the transport format combination, or second ⁇ c and ⁇ d are computed for the TFC based on the signal settings for a reference TFC. Combinations of the two above methods may be used.
  • Several reference TFCs may be signaled from higher layers.
  • the gain factors may vary on radio frame basis depending on the current TFC used. Further, the setting of gain factors is independent of an inner loop power control.
  • the UE shall scale the total transmit power of the DPCCH and DPDCH(s) such that the DPCCH output power follows the changes required by the power control procedure with power adjustments. If the UE applies any additional scaling to the total transmit power as described above, this scaling shall be included in the computation of any DPCCH power adjustments to be applied in the next transmitted slot.
  • EP-A-1 531 557 refers to a mobile communication terminal and method of controlling transmission power for a multiplex radio communication system.
  • the mobile communication terminal comprises a transmission power controller for controlling the power distribution ratio for an adjustment of transmission power of the individual transmission channels, and a priority channel selector for choosing a priority channel from among the individual transmission channels. If a transmission power demanded by the base station is beyond a maximum transmission power of the mobile communication terminal, the gain of a variable gain amplifier is lowered and, as a result, the power levels of the multiplexed channels are evenly reduced below the power level demanded by the base station.
  • a priority setting unit is provided to set the order of priority of channels by using prescribed materials for determining the order of the priority.
  • a transmission power controller compares the transmission power demanded by the communication device and the maximum transmission power of the mobile communication terminal and controls the transmission power of individual channels according to the transmission power demanded by the communication device.
  • a priority setting unit gives priority to a data transmitting channel, if power distribution ratio of the data transmitting channel to the high-speed control information transmitting channel is equal to or smaller than a prescribed threshold value and to the high-speed control information transmitting channel, if the ratio is larger than the threshold value.
  • EP1365520 refers to a base station and to a transmission power control method.
  • a transmission power used by the mobile station in a time slot N is increased. In this case, the total transmission power in the time slot N exceeds the maximum transmission power.
  • the base station makes a channel determiner to determine whether there is channel in which the transmission power of the number of codes (spreading codes) can be adjusted in the time slot N, based on the channel types of the mobile stations, notified by a channel type manager.
  • the determination process can be executed not only on the basis of the types, but also on the basis of various channel characteristics. Accordingly, this technique is an example of adopting the simple channel types as indicators of judgment on whether the transmission power can be adjusted.
  • the determination process results in determining that there is a 384kbps data communication channel (i.e., a channel in which the transmission power or the number of codes can be adjusted in the time slot N) among the type of the channels used by the mobile stations assigned the time slot N. Therefore, the base station makes the transmission power calculator to calculate the transmission power to be decreased in the time slot N in the channel for the mobile station. At the same time, the base station makes the transmission power calculator to calculate the transmission power to be increased (or added to) the time slots N+1, N+2 in the channel.
  • the base station executes the process of equally adjusting the transmission power values as before, or suspends the transmission power adjustment.
  • a mobile terminal for use in a cellular communications network the terminal being adapted to: i) if the terminal transmits signals at a power below the maximum uplink transmission power, distributing the available uplink transmission power between different channels according to a first scheme; and ii) if the terminal transmits signals at a power exceeding or about to exceed the maximum uplink transmission power, distributing the available uplink transmission power between different channels according to a second scheme different from said first scheme.
  • the uplink transmission power of a UE can be controlled such that a loss of performance, particularly for some channels, is less likely or avoided.
  • the uplink transmission power is distributed according to the priorities of the channels.
  • important or "high priority" channels are less affected by an uplink transmission power problem of a UE.
  • important channels such as the Dedicated Physical Data Channel (DPDCH) or the Dedicated Physical Control Channel (DPCCH)
  • RRC Radio Resource Control
  • gain factors are used to define the distribution of uplink transmission power between different channels and at least one of the gain factors of the second scheme is different to a corresponding gain factor of the first scheme.
  • a network element of a cellular communications network the network element being adapted to determine one or more parameters defining the distribution of uplink transmission power between different channels if the maximum uplink transmission power is exceeded or about to being exceeded, wherein at least one of said parameters are different to parameters defining the distribution if the maximum uplink transmission power is not exceeded.
  • a method for an uplink data transmission in a communication system comprisin.g steps of: distributing transmission powers of each channels transmitted by a first transceiver side; monitoring whether a total transmission power of the first transceiver exceeds a maximum transmission power of the first transceiver or not, where the total transmission power of the first transceiver is a summation value of the transmission powers of each channels; re-distributing transmission powers of the each channels by scaling down a transmission power of a channel having a low priority, when the total transmission power of the first transceiver exceeds the maximum transmission power of the first transceiver; and transmitting the each channels to a second transceiver side through the re-distributed transmission powers.
  • FIG. 1 a schematic outline of a mobile telecommunications network according to the Universal Mobile Telecommunications System (UMTS) standard is shown.
  • the typical architecture of such a network comprises mobile user equipments (UEs) 8, a UMTS Terrestrial Radio Access Network (UTRAN) 3 and one or more core networks (CNs) 1.
  • UMTS is a third generation radio network using wideband code division multiple access (W-CDMA) technology.
  • W-CDMA wideband code division multiple access
  • the core network 1 may comprise Mobile Switching Centre (MSC) or Serving GPRS (General Packet Radio Services) Support Nodes (SGSN).
  • the core network is connected via communication links to a number of Radio Network Controllers (RNCs) 4.
  • RNCs Radio Network Controllers
  • the RNCs are dispersed geographically across areas served by the core network 1.
  • Each RNC 4 controls one Radio Network Subsystems (RNSs) 5, including one or more base stations 6 such as "Nodes B" located remote from, and connected by further communication links to, the RNC 4.
  • Each base station 6 transmits radio signals to, and receives signals from, user equipment or terminal 8 which is in an area served by that base station 6.
  • the area is referred to as a "cell”.
  • a UMTS network is provided with a large number of such cells, which are ideally contiguous to provide continuous coverage over the whole network territory. See the UTRAN Overall Description, 3GPP TS 25.401, by 3GPP for more details.
  • UE can simultaneously transmit a Dedicated Physical Data Channel (DPDCH) and a Dedicated Physical Control Channel (DPCCH) in Release 99, a High Speed- Dedicated Physical Control Channel (HS-DPCCH) in Release 5, and a Enhanced uplink Dedicated Physical Data Channel (E-DPDCH) and a Enhanced uplink Dedicated Physical Control Channel (E-DPCCH) in Release 6.
  • DPDCH Dedicated Physical Data Channel
  • DPCCH Dedicated Physical Control Channel
  • HS-DPCCH High Speed- Dedicated Physical Control Channel
  • E-DPDCH Enhanced uplink Dedicated Physical Data Channel
  • E-DPCCH Enhanced uplink Dedicated Physical Control Channel
  • the total transmission power for the channels may exceed the maximum allowed uplink transmission power.
  • a UE must scale the total transmission power to level of the maximum allowed uplink transmission power.
  • the UE monitors whether the total transmission power for the channels exceed the maximum allowed uplink transmission power or not. If the total transmission power for the channels exceed the maximum allowed uplink transmission power, The UE scales the total transmission power with reference to priorities of each channels. That is, the UE maintains the transmission power for the channels having relatively high priority and scales the transmission power for the channels having relatively low priority.
  • a rule of priority assignment is as follow. That is, a priority of a voice channel is higher than a priority of a packet data channel, and a priority of a control channel is higher than a priority of a packet data channel.
  • a DPCCH and a DPDCH have a first priority
  • a HS-DPCCH has a second priority
  • a E-DPCCH has a third priority
  • a E-DPDCH has a lowest priority. Therefore, if the total transmission power for the channels exceeds the maximum allowed uplink transmission power, the UE scales the transmission power for the E-DPDCH or E-DPDCH and E-DPCCH having relatively high priority, while the UE maintains the transmission power for the other channels having relatively high priority.
  • the mechanism can be operated per slot or sub frame or frame.
  • the present invention assumes that the UE transmits simultaneously the DPCCH, the DPDCH and the HS-DPCCH, the priorities of the DPCCH and DPDCH are higher than the priority of the HS-DPCCH, the transmission power scaling is performed by resetting gain factors for each channels, a period of the transmission power scaling is a slot.
  • the maximum UE transmitter power is defined as the minimum of the maximum allowed uplink transmission power as set by the network and the maximum transmit power of the UE, see the 3GPP specification TS 25.133.
  • gain factors ⁇ C , ⁇ D and ⁇ HS are used.
  • the UPLINK power ratio between the DPCCH and the DPDCH is defined by the gain factors ⁇ C and ⁇ D (i.c. by ⁇ C / ⁇ D ), whereas the gain factor ⁇ HS defines the UPLINK power ratio between the HS-DPCCH and DPCCH.
  • ⁇ C is either signalled from the network clement to the UE or calculated by the UE based on settings for a TFC, which are again signalled from network elements to the UE.
  • ⁇ HS is calculated by the UE from so-called offset-values ⁇ HS-DPCCH , which are again signalled by the network elements to the UE.
  • the HS-DPCCH carries acknowledgement and channel quality indication (CQI) signals.
  • CQI channel quality indication
  • ⁇ ACK and ⁇ NACK for the acknowledgement signals
  • ⁇ CQI for the quality indication signals
  • three different ⁇ HS factors may be computed by the UE from the power offset parameters signalled by the network; i.e. two for the acknowledgement messages and one for the CQI signals.
  • Fig. 2A a simplified example is illustrated.
  • the maximum UE transmission power is 1 Watt
  • the power required to transmit signals in all three channels with the same quality as before the deep fade situation would require an uplink power which is greater than the maximum UE transmission power (see Fig. 2B ).
  • the maximum UE transmission power is limited as described above, the UE needs to limit the total UE transmission power to the maximum, UE transmission power.
  • the network provides for additional gain factors ⁇ ' which the UE uses if it is about to exceed the maximum UE transmission power.
  • the UE can apply the gain factors ⁇ ' at the beginning of the next slot.
  • the different channels have typically different priorities. For example, the priority of logical channels like DCCH carrying higher layer signalling is usually higher than for the other channels like DTCH or HS-DPCCH.
  • the available uplink transmission power can be redistributed among the different channels if the UE experiences a power problem, and priorities of different channels can be taken into account.
  • the network provides the UE with a second set of offset values ⁇ HS-DPCCH , i.e. ⁇ ' ACK , ⁇ ' NACK and ⁇ ' CQI .
  • the UE computes the gain factors ⁇ ' HS in the same manner as ⁇ HS but using the offset-value ⁇ ' HS-DPCCH instead of ⁇ HS- DPCCH.
  • the network may signal a single offset-value ⁇ ' HS-DPCCH, which is then used by the UE for transmitting acknowledgement and channel quality indication signals for the HSPDA service.
  • the UE if the UE experiences a power problem, it allocates the available uplink transmission power using the additional gain factor ⁇ ' HS .
  • the UE can thus use an additional power of 0.16 Watts and 0.06 Watts for uplink transmission on the DPDCH and DPCCH, respectively, compared to the case where no additional gain factor is provided.
  • any possible effects of the UE transmitting with a reduced power for the HS-DPCCH are expected to be minor, as the mechanism for acknowledgement in the HSDPA service is very stable and the network may for example increase the number of repetitions in cases where it is known that the UE may often experiences a power problem.
  • the process starts in step 102, and the UE transmits uplink signals in different channels as required. Regularly, the UE determines whether it exceeds the maximal UE transmission power or whether it is about to exceed the maximal UE transmission power (step 104).
  • the UE measuring its transmitted power for a predetermined measurement period, usually for the duration of one slot. From this measurement the UE estimates whether it has reached the maximum allowed uplink transmission power, taking into account tolerances as defined for the UE transmitted power measurement accuracy in the 3GPP specification TS 25.133.
  • the UE determines whether it exceeds the maximum allowed uplink transmission power with more than the tolerances specified for the Open Loop Power Control in the 3GPP specification TS 25.101.
  • step 104 If it is determined in step 104 that the maximum UE transmission power is not exceeded, the UE applies the "normal" gain factors including ⁇ HS to set the power ratio between the different channels (step 106). If, on the other hand, it is detected in step 104 that the maximum UE transmission power is exceeded or is about to be exceeded, the process continues in step 108 by applying the gain factors provided for power problem situations.
  • the UE uses ⁇ HS ' instead of ⁇ HS .
  • the UE uses the gain factors ⁇ HS ' from the beginning of the current or next DPCCH slot.
  • step 110 the UE transmits data using transmission power set on the step 106 or the step 108 and then again monitors the uplink transmission power on the step 104.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Transmitters (AREA)
EP05002833A 2004-02-10 2005-02-10 An apparatus and a method for distributing a transmission power in a cellular communications network Expired - Fee Related EP1564905B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0402896 2004-02-10
GB0402896A GB2411078B (en) 2004-02-10 2004-02-10 Mobile communications

Publications (3)

Publication Number Publication Date
EP1564905A2 EP1564905A2 (en) 2005-08-17
EP1564905A3 EP1564905A3 (en) 2006-06-28
EP1564905B1 true EP1564905B1 (en) 2012-11-28

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EP05002833A Expired - Fee Related EP1564905B1 (en) 2004-02-10 2005-02-10 An apparatus and a method for distributing a transmission power in a cellular communications network

Country Status (7)

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US (1) US7444162B2 (ko)
EP (1) EP1564905B1 (ko)
JP (1) JP4319682B2 (ko)
KR (1) KR101133875B1 (ko)
CN (1) CN1914835B (ko)
GB (1) GB2411078B (ko)
WO (1) WO2005076500A1 (ko)

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